Driving mechanism for turntables of talking machines



J. W. DYER April 8, 1930.

DRIVING IECHANISM FOR TURNTABLES OF TALKING MACHINES Filed Jan. 14, 1929w MWL mw m. M WW a W23 M m M M 4 I .9 MW a I H j 1 M! H./, I Q, W11! H rU y w M m m a m m m INVENTQW ATTORNEY 4 z a W &

a .m w 4 wman wiwrvw z 5| FLIP QM Patented Apr. 8, 1930 1 UNITED STATESJOHN W. DYER, OF EAST ORANGE, NEW JERSEY DRIVING MECHANISM FORTURNTABLES F TALKING MACHINES Application filed January 14, 1929. SerialNo. 332,480.

My invention relates to improved mechanism for driving the turntables oftalking machines and preferably where such talking machines are utilizedin connection with motion pictures where it is necessary that the soundrecord and the film shall operate in synchronism.

In an application of Frank L. Dyer. Apparatus for reproducing soundrecords, filed January 2, 1929, Serial No. 329,800, there is shown anapparatus including two turntables adapted to be operated alternately,the driving mechanism being intended to actuate either turntable at aspeed which shall correspond to and be in synchronism with the projectedfilm and providing means also by which either turntable may be operatedat a slightly higher speed and preferably at a slightly lower speedwhereby the sound record may be brought into synchronism with the film,when for any reason the two become non-synchronous.

' My invention provides driving mechanism which is somewhat simpler inconstruction than that disclosed in said application and wherein the useof ratchets and pawls is dispensed with.

Broadly stated, my invention comprises a turntable which is normallydriven by means of a friction drive in combination with gear ing andalso in providing for a somewhat higher speed. which when brought intoaction, will cause the turntable shaft to turn slightly faster than andwith respect to said friction drive. The invention also preferablyutilizes a second gearing, which when brought into action will slightlyretard the turntable shaft with respect to said friction drive. 40 Inorder that the invention may be better understood, attention is directedto the accompanying drawing forming part of this specification, and inwhich- Figure 1 is. a vertical elevation, partly in section, of drivingmechanism embodying my improvements.

Figure 2 is a vertical section through the turntable shaft and drivingelements thereon. Figure 3 is a section on the line 3-3 of Figure 1.

In the drawings, corresponding parts are represented by the samereference numerals. I here show only a single turntable 1, althoughpreferably two turntables will be employed as disclosed in saidapplication, operated in alternation whereby when the sounds recorded onone have been reproduced, the other may be immediately started to thusprovide continuous sound reproduction. The

turntable 1 is carried by shaft 2 mounted in meshing with gear 14 looseon the driven or turntable shaft 2. The latter shaft is driven from gear14 through friction disks 15, 15 splined on the turntable shaft 2 andheld frictionally in engagement with the surfaces of said gear byadjustable springs 16, as shown particularly in Figure 2. This providesfor the normal or synchronous speed of the turntable 1.

In order to provide for a slightly higher speed, I make use of a gear 17keyed to shaft 12 and meshing with gear 18 loose on the turntable shaft2. The gear ratio between 17 and 18 provides for a slightly higher speedthan between gears 13 and 14. In order to connect the gear 18 with theturntable shaft 2, I may employ a toothed ring 19 on the gear 18 adaptedto be engagedby a toothed ring 20 on a collar splined to the shaft 2.This collar may be actuated bya yoke 21 and hand lever 22. Whenthe rings19 and 20.are engaged together, it will be seen that the gear 18 willturn the shaft 2 at a slightly higher speed, causing the friction disks15, 15 to advance in respect to the gear 14; I

To provide for a slightly lower speed I employ a gear 23 keyed ondriving shaft 12 meshing with gear 24 loose on the turntable shaft. Thegear 24 may be connected to the turntable shaft 2 through toothed rings25 and 26 corresponding with the rings 19 and 20. The rings 20 and 26considered together, constitute a collar 27 before referred to. Byoperating the lever 22, the toothed rings 25 and 26 will be engagedwhereby the turntable shaft will be rotated at a slightly lower speedthan normal through the operation of the friction disks 15, 15 whichw1ll slide slowly in a rearward direction with respect to the gear 14.In other words, the low speed gearing acts in effect as a brake devlceto bring about a somewhat lower speed than that normally effected by thegearings 13 and 14. Normally the lever 22 may be held in a centralposition by a double spring 28, as shown.

Any suitable mechanism may be substituted for connecting the turntableshaft 2 with either gear 20 or 24: and if desired, electric mechanismmay be employed for the pur pose, as disclosed in said application.

Having now described my invention, what I claim as new therein anddesire to secure by Letters Patent, is as follows:

1. The combination with a turntable and a driven shaft connectedtherewith, of a driving shaft, friction means between the shafts forrotating the driven shaft, normally disconnected gearing between saidshafts, and means for connecting said gearing whereby the driven shaftwill be turned at a slightly higher speed with respectto said frictionmeans.

2. The combination with a turntable and a. shaft connected therewith, ofa driving shaft, friction means between said shafts for drivingthedriven shaft, normally disconnected gearing between said shaftsproviding for a slightly higher speed, and clutch mechanism forconnecting said gearing with the driven shaft.

3. The combination with a turntable and a shaft connected therewith, ofa driving shaft, friction means between said shafts for driving thedriven shaft at normal speed, normally disconnected gearing between saidshafts, and means for connecting said gearing with the driven shaftwhereby the driven shaft will be retarded and caused to be driven at aslightly lower speed.

4;. The combination with a turntable and a driven shaft connectedtherewith, of a driving shaft,,friction means between said shafts fordriving the driven shaft at normal speed, normally disconnected gearingbetween said shafts, and clutch mechanism for connecting said gearingwith the driven shaft whereby said shaft will retarded and be driven ata slightly reduced speed.

5. The combination with a turntable and a shaft connected therewith, ofa driving shaft, friction means between said shafts driving the drivenshaft at normal speed,

gearing between said shafts providing for a slightly higher speed, asecond gearing between said shafts providing for a slightly JOHN W.DYER.

